Surface tread for a spiral staircase
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United States of America Patent
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-
Dec 5, 2000
Grant Date -
N/A
app pub date -
Jan 28, 1998
filing date -
Jan 28, 1998
priority date (Note) -
Expired
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Abstract
A spiral staircase includes a newel post and a plurality of steps which are mounted around the newel post. Each step has a surface tread. The tread is set up higher than the inner side. The slope of the tread at the outer side of the tread is sharper than at the inner side of the tread.
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