| 摘要 |
1341595 Tyre building apparatus NATIONAL-STANDARD CO 27 May 1971 [18 June 1970] 17454/71 Heading B7C Tyre building apparatus comprises an inter- mediate drum 4, embodying axially movable drum expanding and contracting means (Specification 1,323,778), disposed between end drum assemblies 5, (6), tyre carcass material 210 overlying the drum 4 and ply turn-up bags 138 of the drum assemblies prior to operation of the apparatus, Fig. la, said operation consisting of partially expanding the drum 4 by rotation of worm 28 causing ring 20 to move together with the axially inward movement of bead shoulder supporting means 63 and carrier means 68. Simultaneously air is introduced through conduit 131 to move piston 125 inwardly and tyre bead flipper means to their Fig. 2a position to form tyre bead shoulders 52. Since sleeve 51 of the apparatus is inextensible and clamped at each end, for the carcass material to remain the same length during the formation of the shoulders air is introduced through hose 118 into cylinder 82 causing the carrier means and hence the clamp means 172, 174 to move inwardly. The tyre beads are now inserted into position and the bags 138 used to turn up the carcass ends 211. The intermediate drum is then further expanded and the tread and sidewall components applied. Collapse of the drum 4 allows the tyre to be removed from the apparatus, the air being at the same time released to permit the flipper means 156 to return to their Fig. 1a, position by the pressure of the tyre and sleeve 51. Air is then introduced into cylinder 82 at the outer end of piston 80 to move the carrier means 68 outwards and retension sleeve 51. The apparatus provides for the spacing of the tyre beads in a desired spaced apart relationship by screwing in and out a threaded stud 112 thus locating carrier member 73 on which the flipper means 156 are mounted. |
