Patent ID: 7444849
Filing Date: 2008-11-04
Classification: B21D

Abstract:
1. Apparatus for bending tube, pipe, and conduit comprising: a bending shoe of generally circular wheel form mounted for rotation about a first axis and having at least one semicircular concave groove and at least one row of gear teeth on the outer peripheral surface thereof, said groove and said gear teeth located in a side by side axially spaced parallel planes perpendicular to said first axis, wherein said groove provides means for retaining a pipe on said bending shoe; a generally cylindrical first drive-gear mounted for rotation about a second axis, having at least one row of gear teeth on its outer surface thereof; said second axis on said first drive-gear parallel to said first axis on said bending shoe; a gear rack of generally rectangular board mounted for up and down motion along the length direction, having a first surface and a second surface opposite and parallel to said first surface, said first surface having at least one semicircular concave groove and at least one row of gear teeth thereon, and said second surface having at least one row of gear teeth thereon, said groove and said gear teeth located side by side in axially spaced parallel planes perpendicular to said first surface and said second surface; and a frame assembly pivotally supporting said first axis on said bending shoe, supporting said gear rack length-wise, positioning said groove and said gear teeth on said first surface on said gear rack engaging to said groove and said gear teeth on said bending shoe, pivotally supporting said second axis on said first drive-gear, positioning said gear teeth on said first drive-gear engaging to said gear teeth on said second surface on said gear rack.