Center mechanism for tire building drum
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United States of America Patent
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Issued Date -
Jan 25, 2018
app pub date -
Aug 8, 2016
filing date -
Jul 22, 2016
priority date (Note) -
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Abstract
A tire building drum is rotatably mounted on a central drive shaft and includes a center portion. A center mechanism for the drum is disposed in the center portion and includes a hub that seats on and is secured to the central drive shaft. An axially-extending piston seats on and extends circumferentially about the hub. A cylinder cooperates with the hub and the piston to form a pneumatic chamber. A plurality of links are connected to the piston and a plurality of segment bars are disposed about the circumference of the center mechanism. Each one of the segment bars is connected to selected links and seats between a lip of the cylinder and a distal end plate. When compressed air is introduced into the pneumatic chamber, the piston moves in an axial direction, actuating movement of the links and in turn actuating radial movement of the segment bars.
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