Means and method for bending elongated materials incorporating two arms
OwnerShunpei Kawanamiinventor
Life of this patent
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Abstract
A means and method for bending elongated materials having a device for locally heating a portion of the material and a freely pivotable bending arm, is provided with a second arm for advancing the elongated material past the heating device and, in cooperation with the pivotable arm, exerting a bending moment on the locally heated portion of the material.
Claims7
An apparatus for bending elongated materials, comprising:
- a. heating means for locally heating a portion of the material;
- b. an arm which is freely pivotable about an axis, the pivotable arm including means for clamping a leading portion of the material;
- and,
- c. means for advancing the material past said heating means, and for applying a bending moment to said material in cooperation with
- said pivotable arm including:
- a second arm;
- a bearer connected to said second arm for engaging a portion
- of said material not yet advanced past the heating means;
- guide means for maintaining the second arm in an orientation approximately vertical to the principal axis of the unbent portion of the material;
- and,
- traction means for moving the second arm toward the axis of the pivotable arm.
In a hot bending method for bending elongated material in which elongated material to be worked is passed through an annular heating means for heating the material to a high temperature in a limited area with a leading portion of the material being clamped to an arm pivotable about an axis within the plane of the heating means, the arm having a length approximately equal to the bending radius of the pipe, and then continuously and straightforwardly advancing the pipe while heating the pipe locally by the heating device to a plastic inducing temperature to cause continuous plastic deformation in the heated area of the pipe, the improvement wherein a trailing unbent portion of the material is clamped to a second arm and advanced toward the heating means so that the unbent portion is flexed in an arc, a tangent of which is maintained approximately perpendicular to the plane of the annular heating means.
A metal material bending apparatus comprising annular heating means for heating metal material to be bent, annular cooling menas for cooling said material, a bearer adapted to hold a first end portion of said material and provided on a swingable arm, the axis of swing of said arm being positioned within the plane of said annular heating means, another bearer adapted to hold an end portion of said material and provided on a second arm, and traction means for moving the second arm in a direction substantially perpendicular to the second arm's longitudinal axis, said traction means being disposed beween the axis of said swingable arm and a point on said second arm, said point being located approximately the length of the bending radius from the end portion of said material.
Dependencies are inferred from the claim text.