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Inflatable bladder for a tire building drum

  • US 4,087,307 A
  • Filed: 08/30/1976
  • Issued: 05/02/1978
  • Est. Priority Date: 08/30/1976
  • Status: Expired due to Term
First Claim
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1. A turnup bladder and a tire building drum, the drum having a circumferential bladder seating groove open radially outwardly thereof and a circumferentially extending outwardly open U-shaped channel for air spaced axially from said groove, said bladder being secured to said drum only by its own elastic tension, said bladder comprising an annular inflatable tube having in its uninflated condition an inner edge disposed proximate said groove, an outer edge disposed at an axial distance from the groove and a generally cylindrical wall extending between said inner and said outer edge and snugly engaging said drum, an elastic ring secured integrally to said inner edge and adapted to seat snugly conjugately in said groove, a pair of circumferentially extending ribs integral with said wall snugly engaging said drum circumferentially respectively adjacent and axially outward of said channel, and a flangeless port in said wall between said ribs providing open communication between said bladder and said channel for air flow therebetween independent of the relative angular relation of said bladder and said drum.

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