| 摘要 |
A generally circular die is mounted on a rotatable shaft in non-rotatable relation thereto. The periphery of the die is formed by a plurality of separate arcuate (circular) portions curved along a path equal in radius to the desired radius of curvature of the bend in the different size pipes being bent. Each of the arcuate portions includes a hemispherical recess having a diameter differing from the others and substantially equal to the outer diameter of the tube being bent in that particular arcuate portion. A force transmitting member is secured by an arm to the aforementioned vertical shaft and is rotatable therewith. The surface of the force transmitting member is provided with a plurality of separate arcuate portions, each having a hemispherical recess therein corresponding to those on the corresponding portion on the die face opposite. A segment of each arcuate portion of the die includes a plurality of teeth or studs implanted therein which grip the surface of the pipe positioned therein and resist relative sliding movement between the pipe and the arcuate portions of the die. The force transmitting member is connected to the die by means of a support arm, which so positions the force transmitting member with respect to the die that it extends outwardly beyond the surface of the die a distance substantially greater than the diameter of the pipe being held therein.
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