Tire building apparatus with improved drum shoulder

Details Tire building apparatus with improved drum shoulder Tire building apparatus with improved drum shoulder

B - Operations, Transporting

29

D

154/18.7, 154/19

B29D 30/32 (2006.01) B29D 30/24 (2006.01)

Patent

CA 1109385

ABSTRACT An expandable tire building drum is provided with hinged drum shoulder segments that present, when the drum is in its expanded position, a bevelled shoulder contour for supporting the thickened portion of the tire band next to the bead. This bevelled contour results in a greater radius or curvature for the thickened tire portion that extends around the drum shoulder, which makes it easier to pass a stitcher wheel over this portion of the tire, and to achieve a more uniform layering of the tire components next to the bead of the tire. When the drum is in its retracted positions the hinged drum shoulder segments are lifted to positions wherein they provide support for the carcass plies of the tire when they are first laid across the drum segments and the bead turnover bladders.

318917

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