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An apparatus for building a tire having an inner liner to which a sealant strip is to be laminated, comprises a rotary drum having a surface in which a trough or “groove”is provided. The depth of the groove corresponds approximately to the thickness of a layer of an elastomeric sealant which is to b

An apparatus for building a tire having an inner liner to which a sealant strip is to be laminated, comprises a rotary drum having a surface in which a trough or “groove”is provided. The depth of the groove corresponds approximately to the thickness of a layer of an elastomeric sealant which is to be placed in the groove. If the walls of the groove are contoured so as to confine the sealant layer in a specified manner while accommodating the thermo-viscous properties of the laminate, the completed first stage carcass may be removed without damaging the sealant layer which is adhered to the inner liner. The rotary drum is provided with fingers movable to a position to support the tire bead by means of an annular piston and cylinder surrounding the shaft of the drum and connected to the fingers by bell cranks which are pivotally mounted in the drum and operatively interconnected with means to move the fingers radially between an inactive position and a bead engaging position in response to appropriate axial movement of the drum mechanism.

대표청구항 ▼

A building drum assembly for building a first stage carcass of a sealant tire having a sealant strip adhesively secured to the inner surface of the liner of said carcass, said assembly comprising a shaft; a central building drum rotatably supported by said shaft; means exterior to the central buildi

A building drum assembly for building a first stage carcass of a sealant tire having a sealant strip adhesively secured to the inner surface of the liner of said carcass, said assembly comprising a shaft; a central building drum rotatably supported by said shaft; means exterior to the central building drum to turn over edges of the carcass; a plurality of movable fingers carried by said central drum adjacent each of its edges, said fingers being interconnected to lateral, grooved segments which together in side-by-side relationship provide an expansible cylindrical drum surface, said fingers being rotatable with said central drum; each said grooved segment having a single groove symmetrically disposed relative to the circumferential center plane of said central drum, said groove being adapted to provide an upper surface having contoured sidewalls in which at least a portion of the surface of each sidewall flares outwardly at an angle a15°to 80°to the horizontal, to accommodate a sealant strip of sufficient width; annular cylinder means surrounding said shaft and fixed relative thereto; annular piston means positioned in said cylinder means and axially movable therein relative to one another; and motion converting means connecting said piston means and said fingers to move said fingers and associated grooved segments radially between a retracted, inactive position and an extended, bead supporting position in response to axial movement of said piston means.