ANNULAR CORE PIECE AND ANNULAR CORE
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United States of America
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Issued Date -
Jan 9, 2020
app pub date -
Jan 29, 2018
filing date -
Jan 29, 2018
priority date (Note) -
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status (Latency Note)
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Abstract
An annular core piece in which an annular core piece can be received inside a contour of an outer circumstance of the annular core piece and the number of recesses formed on the outer circumstance is small is provided. In an annular core piece including a plurality of recesses opened in an outer circumferential part, the recess includes a narrowed part and a raised part, and a transverse width of the narrowed part is made narrower than a transverse width of a different region present on a side of a bottom of the recess further beyond the narrowed part, and the raised part is formed such that a part of the bottom of the recess is raised and projected toward an opening end of the recess.
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