HINGE AND HINGE-PRODUCING APPARATUS AND APPERTAINING METHOD FOR A CORNER EDGE OF A RECTANGULAR TUBE
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United States of America Patent
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N/A
Issued Date -
Jul 5, 2007
app pub date -
Dec 18, 2006
filing date -
Dec 29, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method and apparatus for creating a hinge on a corner edge of a rectangular tube as well as a tube so produced is provided in which a roller having a line defining a diameter of the roller at approximately 45.degree. from a line defining a planar surface of the rectangular tube, a pivot axis of the roller being oriented to permit the roller to roll longitudinally down a length of the tube. The roller comprises a v-shaped indent disposed radially around its outer periphery and a groove located at an apex of the v-shaped indent. Pressure is applied by the roller against the tube in a radial direction of the roller, thereby contacting a corner edge of the tube with the groove to stress tube material at the corner edge. A relative movement is induced between the roller and the tube in a longitudinal direction of the tube, thereby creating a hinged corner edge of the tube.
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