Patent ID: 6640863
Filing Date: 2003-11-04
Classification: B29D

Abstract:
In a tire building drum comprising a main shaft, a pair of movable bodies movably supported by the main drum shaft in an axial direction, approaching-separating means for moving these movable bodies in opposite directions so as to approach or separate them, plural bead lock segments movably supported by each of the movable bodies in a radial direction, enlarging-contracting means for synchronously moving these bead lock segments in the radial direction so as to enlarge or contract them, a seal member sealing space among the movable body, bead lock segments and a tire constitutional member is supported by the bead lock segments enlarged by the enlarging-contracting means from an inside in the radial direction, a hollow cylindrical body movably fitted onto the outside of the movable body in the axial direction and plural turnup fingers each rotatably connected at a base end part thereof to an axially outer end portion of the hollow cylindrical body and arranged so as to extend substantially inward in the axial direction and separate away in a circumferential direction,an improvement wherein the seal member comprises an inner elongated portion extending axially inward from a base end part airtightly fixed to the movable body and located at the inside of the bead lock segment in the axial direction and an outer elongated portion extending outward from an inner end of the inner elongated portion in the axial direction and covering radially outer portions of the bead lock segments at its top end part; and wherein a finger receiver projecting outward in the axial direction is arranged at the outer end portion of the bead lock segment in the radial direction so as to place the top end part of the turnup finger on the finger receiver.