Semispherical shoe and manufacturing method therefor
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United States of America Patent
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Jan 26, 2010
Grant Date -
Feb 7, 2008
app pub date -
Aug 23, 2005
filing date -
Sep 3, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
that are not in slidable contact with the concave portion. When the semispherical shoe is manufactured, first, after a semispherical material having a semispherical surface following the concave portion has been formed, the surface of the portion that is to be the slidably contacting surface on the semispherical surface is quenched to expand the quenched portion from the original surface of the semispherical surface, whereby the sliding surface is formed on the surface of the expanded portion, and the other portions are made the non slidably contacting portions.
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