| 摘要 |
<p>"TUBE BENDER CONSTRUCTION" A tube bender construction (10,110,210) for manual operation in bending a tube (T). The tube benders include a mandrel (11,111,211) defining a bending groove (12,112,212) into which the tube is urged by a forming member (13,113,213) mounted to the mandrel to swing about a bending axis of the bending groove. The tube to be bent is held against longitudinal movement during the bending operation. Movement of the forming member about the bending axis is effected by manipulation of a pair of handles (17,18;117,118;219,220). The handle connected to the mandrel is removably connected thereto as for removal when the mandrel is vise-mounted. The tube clamping structure includes a hook (16,116,218) which is swingably mounted to the mandrel, and in the illustrated embodiment adjusting structure (130) is provided for adjusting the disposition of the swingable hook to provide a desired clamping force of the hook against the tube. The adjusting structure includes, in one form, an eccentric pin (132) and structure (143) for locking the pin in adjusted positions. In one form, the forming member (213) is swingably mounted to the form wheel (211) to be adjustable toward and from the form wheel groove (212) to accommodate variations in tube diameter and normal wear of portions of the tube bender during the life thereof The form wheel defines a concave force transfer surface (242) having an improved engagement with the tube to be bent so as to effectively improve maintained tube roundness for effectively minimized stress formation in the bent tube.</p> |
