Rotary joint for transferring melted plastic
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United States of America Patent
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Oct 18, 2016
Grant Date -
Dec 24, 2015
app pub date -
Jan 21, 2014
filing date -
Jan 21, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A rotary joint for transferring melted plastic from at least one extruder to a plurality of molds of a rotary machine for molding preforms, the joint comprising a fixed structure (3′) provided with a fixed longitudinal element (23) therein, defining a longitudinal axis (Y), and a movable structure (3″) which can rotate about said axis (Y) and is adapted to be integrally fixed to the rotary machine; wherein a first passage channel (11) is provided within said fixed element (23); wherein a second passage channel (11′) is provided within said movable structure (3″) and coaxial to said first passage channel; said second passage channel (11′) being in communication at a first end thereof with said first passage channel (11), and being in communication at a second end thereof with a plurality of lateral radial channels (52) provided within said movable structure (3″); wherein there is provided, between the fixed structure (3′) and the movable structure (3″), a gap in which a spiral seal (24) is arranged for ensuring the action of sealing the melted plastic between said fixed structure and said movable structure.
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