Patents Assigned to Uniao Industrial de Borrachs S/A UNISA
  • Grooved envelope for recapping or retreading tires
    Patent number: 5281118
    Abstract: A vulcanized rubber device to envelop a tire being recapped or retreaded, when place in an autoclave to vulcanize the rubber strip cemented between the new tread and the treated tire. This device, has an annular form, with a "U" section, whose lateral surfaces (5), are provided with a hole (2) and (4), and surrounding a circular opening (3), but has a new feature; a ring with grooves (1), on the inside of each internal lateral surface (4) and (5), forming radiating furrows.
    Type: Grant
    Filed: January 24, 1992
    Date of Patent: January 25, 1994
    Assignee: Uniao Industrial de Borrachs S/A UNISA
    Inventor: Marconi G. Alvarenga