Apparatus for withdrawing a screw from the barrel of a screw extruder
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United States of America Patent
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Oct 15, 2002
Grant Date -
N/A
app pub date -
Sep 18, 2000
filing date -
Sep 24, 1999
priority date (Note) -
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Abstract
Apparatus for withdrawing at least one screw from the barrel of a screw extruder in conveying direction of the screw extruder, with the screw defining a longitudinal axis and terminating in a screw cap, includes at least one gripper having a free end for attachment of a pull mechanism and a grabbing end for interaction with an undercut of the screw cap. The grabbing end is formed with a plurality of radially resilient clamping segments for formation of a hollow cylinder having an inner diameter, which substantially corresponds to an outer diameter of the screw cap, and an outer diameter which is smaller than a diameter of a bore of the barrel. Each resilient clamping segment terminates in a beaded end which extends radially into the hollow cylinder for formation of a claw, wherein the beaded end has a wall thickness which is smaller than a difference between a radius of the barrel bore and an outer radius of the screw cap, and, in longitudinal direction of the gripper, a length which is smaller than a width of the undercut of the screw cap in longitudinal direction of the screw.
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