Abstract: A device for bending tubes including a platform, a feeding mechanism having a sliding seat, a pair of lugs, and a chuck, a chuck controlling mechanism having a direction controller and a chuck driving gearing, an idle gear pivotally mounted on the sliding seat and constantly meshed with the feeding mechanism, and a bending mechanism having a right roll die, a left roll die, an upper roll die, and lower roll die each of which has a recess around a circumference thereof adapt to the shape of a tube to be bent, whereby a tube can be conveniently bent into a spiral or a curve as desired.

Abstract: A pipe bending device which is composed of a drive wheel, a plurality of guide wheels, a pair of guide molds and a mandrel, wherein the guide wheels having a main guide wheel which is installed under the drive wheel, the pair of guide mold being composed of a first guide mold and a second guide mold which are engaged respectively with the drive wheel and the guide wheels and can be drived to move, the first guide mold being formed into a curve shape, the pipe being installed between the first guide mold, the end of the pipe being fixed at the end of the first guide mold, thus the pipe can be stretched and bended by the first guide mold to form a curve when the pair of guide molds being drived to move, the mandrel being inserted into the inner hole of the pipe so as to prevent the pipe from deforming in bending process As a result the inner surface of the bending part can be kept smooth.