Apparatus for the building of tires using a clamped turn-up bladder
AssigneeCompagnie Generale des Etablissements Michelin - Michelin & Cie
InventorMichel Remond
Life of this patent
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Abstract
The present invention concerns a tire-building process in which a so-called "shaping" building drum is used and in which a ply turn-up bladder (2) is clamped on the outside of each bead recess (6) by an assembly of pallets (11) which can open in fan shape and cover the turn-up bladder completely in circumferential direction and in part in axial direction. The axial displacement of the said pallets (11), controlled by the axial displacements of two pistons (7) and (8), makes it possible to modify the shape of the ply turn-up bladder (2).
Claims11
An apparatus for building a tire having reinforced beads by turning up a carcass sleeve on both the axially inner and axially outer sides of a bead wire comprising an annular turn-up bladder on which a carcass sleeve is placed for shaping, bead locking means for clamping the bladder and sleeve against a bead wire encircling the sleeve, means clamping an end of the bladder circumferentially and axially, leaving an unclamped turn-up portion of the bladder for turning-up the carcass sleeve located axially outwardly relative to the bead wire, means inflating the bladder to expand the carcass sleeve radially outwardly relative to the bead wire, means expanding the carcass sleeve located axially inside of the bead wire, the unclamped turn-up portion of the bladder forming an annular bulge of greater circumference than the clamped portion for turning up an end of the carcass sleeve, and means displacing the circumferential clamping means for the end of the bladder axially inwardly and radially outwardly during the inflation of the bladder while limiting the expansion of the clamped portion of the bladder.
An apparatus for building a tire having reinforced beads by turning up a carcass sleeve on both the axially inner and axially outer sides of a bead wire comprising an annular turn-up bladder on which a carcass sleeve is placed for shaping, means clamping an end of the bladder circumferentially and axially, leaving an unclamped turn-up portion of the bladder for turning-up the carcass sleeve, bead locking means intermediate opposite ends of the bladder for clamping the bladder and sleeve against a bead wire encircling the sleeve, thereby dividing the annular, unclamped portion of the bladder into axially inner and outer portions, means inflating the inner and outer portions of the bladder to expand the carcass sleeve radially outwardly relative to the bead wire, the inner portion of the bladder imparting an axially and radially outward displacement to the carcass sleeve and the unclamped outer portion of the bladder forming an annular bulge of greater circumference than the clamped portion for turning up an end of the carcass sleeve, and means displacing the circumferential clamping means for the end of the bladder axially inwardly and radially outwardly during the inflation of the bladder while limiting the expansion of the clamped portion of the bladder to an expanding conical shape.
Dependencies are inferred from the claim text.