Plug-resistant arch-vents for a tire mold

Details Plug-resistant arch-vents for a tire mold Plug-resistant arch-vents for a tire mold

1988-02-08

1989-11-21

Housel, James

Plastic article or earthenware shaping or treating: apparatus

Reshaping, resizing or vulcanizing means for tire, tire...

249141, 425812, B29C 3310

Patent

active

048818810

ABSTRACT:
A split tire mold having a tread ring having arch-vents for venting air circumferentially across the inner surface of the tread ring so that air escapes from the parting line of the mold halves. The "dougle-wedge-shaped" arch-vents provide passage for trapped air above each tread block of the tread as it is moved against the inner surface of the tread ring. The shape of the arch-vent passages and the angulation of the wedges is critical to the effectiveness of the arch-vent which forms an arch-vent bridge of cured rubber in a cured tire. The configuration of the bridge allows a cured tire to be easily removed from the mold cavity without leaving a broken-off piece of the rubber bridge to plug the arch-vents. This arch-vent design leaves flat-sided, narrow wedge-shaped pieces of rubber as the arch-vent stubs, tapered in two directions. The arch-vent stubs, viewed in the radial direction are so unobtrusive as to be cosmetically acceptable in a finished tire. The upper surface of the arch-vent is close to the inner surface of the tread ring and essentially horizontal, while the lower surface of each arch-vent is inclined at an angle in the range from 30.degree. -50.degree. to the horizontal plane, but in opposite directions. An angle in this range provides strength in the base area of the arch-vent stub so that, upon stripping the tire from the mold, the arch-vent bridge of cured rubber breaks cleanly and reliably at the narrowest and weakest point in the bridge.

REFERENCES:
patent: 1880430 (1932-10-01), Furnas
patent: 4023268 (1977-05-01), Momchilov
patent: 4708609 (1987-11-01), Yoda et al.

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