Foothold
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United States of America Patent
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Jun 30, 1998
Grant Date -
N/A
app pub date -
May 16, 1996
filing date -
May 22, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A foothold of a manhole, a quay, and the like which enables operators to put their feet or foot on a tread in a natural state under a stable condition, and to reduce their fatigue with their feet or knees when they move up and down in a manhole by use of the foothold. The foothold of the manhole, the quay, and the like comprises the tread and side portions continued from and positioned at both sides of the tread, wherein at least the upper surface of the tread is inclined upward from a central portion of the tread toward the side portions at an angle ranging from 1 to 5 degrees.
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