Bottom zone turn-up membrane

Details Bottom zone turn-up membrane Bottom zone turn-up membrane

2006-12-14

2010-06-22

Knable, Geoffrey L (Department: 1791)

Adhesive bonding and miscellaneous chemical manufacture

Surface bonding means and/or assembly means therefor

Tire body building type

C156S132000, C156S415000

Reexamination Certificate

active

07740040

ABSTRACT:
A shaping drum for a tire blank comprising bottom zones formed of a circular reinforcement ring which is moved in rotation about an axis XX′, comprising bead-holding means (2a, 2b) mounted opposite one another on a central spindle. Each of the bead-holding means comprises a support (5a, 5b) mounted to be axially movably relative to the spindle. An assembly of return segments (9a, 9b) is distributed circumferentially around the axis XX′, which circulate radially between two circular rings (6a, 7a, 6b, 7b) fixed on the support (5a, 5b), and comprises a bead-receiving seat (10a, 10b). A turn-up membrane (12a, 12b) can slide over the bead-receiving seat, anchored in an airtight manner by its two ends (121a, 122a, 121b, 122b) on the radially outer circumference of the circular rings (6a, 7a, 6b, 7b) and anchored mechanically by appropriate means (14a, 14b) on the return segments (9a, 9b) along a circumferential anchoring line (90a). The section of the bead-receiving seat (10a, 10b) is of essentially circular shape with a developed length L1, and the circumferential anchoring line of the turn-up membrane (121, 12b) on the return segments (9a, 9b) is axially offset towards the centre of the drum by a length L2relative to the bead receiving seat (10a, 10b), the length L2being between 0.7 and 2 times the length L1.

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patent: 0 492 239 (1992-07-01), None
patent: 1 510 330 (2005-03-01), None

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