Method of producing inner spiral grooved tube and apparatus for producing inner spiral grooved tube
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United States of America Patent
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Jul 6, 2021
Grant Date -
May 30, 2019
app pub date -
Jan 30, 2019
filing date -
May 28, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus for producing an inner spiral grooved tube, the apparatus includes first and second bobbins, one of which is an unwinding bobbin and the other of which is a winding bobbin; a floating frame that supports a shaft of the first bobbin; a rotary shaft that supports the floating frame though bearings and rotates in a direction perpendicular to an axis of a bobbin in the floating frame; a revolving flyer configured to invert a tube route of a tubular material between the first bobbin and the second bobbin, to convey the tubular material, and to revolve the tubular material around the floating frame as being supported by the rotary shaft; and first and second drawing dies positioned on a front stage and a rear stage of the revolving flyer, respectively, in the tube route of the tubular material
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