Drum and method of shaping a radial tire

Details Drum and method of shaping a radial tire Drum and method of shaping a radial tire

B - Operations, Transporting

29

D

154/19.8

B29D 30/36 (2006.01)

Patent

CA 1154660

DRUM AND METHOD OF SHAPING A RADIAL TIRE ABSTRACT OF THE DISCLOSURE A radial tire carcass 13 fabricated by a first stage process has bead portions 17,18 which are placed over a pair of spaced-apart coaxial bead seats 19,20. The bead seats 19,20 may be segmented radially expan- dable rings 22,23 which are expanded by fluid pressure into engagement with the bead portions 17,18. The tire carcass 13 is initially positioned on the drum 10 with the bead seats 19,20 at a spaced-apart distance so that upon expansion of the segments 59 of the bead seats 17,18 at a low pressure and axial movement apart of the bead seats 19,20 the ply 14 of the tire carcass 13 if stretched and the bead portions 17,18 moved into register on the bead seats 19,20. The fluid pressure expanding the segments 59 of the bead seats 19,20 is then increased to secure the bead portions 17,18 on the bead seats 19,20 at predetermined positions with a pre- determined diameter. Annular sealing members 63 may be mounted on the segments 59 of the bead seats 19,20 at the tire-supporting surfaces 62 of the segments 59 for compression upon application of high pressure. The sealing members 63 may also have flaps for bridging the space between the bead portions 17,18 of the tire 13 and mounting rings 22,23 for the segments 59 of the bead seats 19,20 so that the tire 13 may be inflated after registration of the bead portions 17,18 and while the bead seats 19,20 are moved axially together for the application of the tread and belt ply.

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