Vent piece, tire vulcanization mold with vent piece, and tire manufactured using tire vulcanization mold
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United States of America Patent
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Jan 16, 2018
Grant Date -
Nov 26, 2015
app pub date -
May 18, 2015
filing date -
May 23, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A vent piece for a vent channel of a tire vulcanization mold includes a cylindrical tube formed to be installed in a cavity end portion of a vent channel of a tire vulcanization mold and having a through hole extending in axial direction of the channel, and a plug positioned in the through hole and moves between closed and open positions. The plug has a second bearing surface facing a first surface of the tube such that the second surface of the plug makes contact with the first surface to close the channel in the closed position and the second surface is separated from the first surface to open the channel in the open position, and the first and/or second surfaces has a film formed at least on a portion of the first and/or second surfaces such that the film reduces friction between the first and second surfaces.
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