Foothold

Details Foothold Foothold

1996-05-16

1998-06-30

Graysay, Tamara L.

Road structure, process, or apparatus

Pavement

Anti-slip surface

404 34, 404 44, 182 90, E01C 1124, E01C 500, E04G 300

Patent

active

057723583

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.

REFERENCES:
patent: 601849 (1898-04-01), Aiken
patent: 2064803 (1936-12-01), Grove
patent: 4100997 (1978-07-01), Peacock
patent: 4241543 (1980-12-01), Foscarini et al.
patent: 4610330 (1986-09-01), Borst
patent: 4655318 (1987-04-01), Bowen
patent: 4660681 (1987-04-01), Zenhausern
patent: 4702349 (1987-10-01), Zenhausern
patent: 4771861 (1988-09-01), Zenhausern et al.
patent: 4778032 (1988-10-01), Takahashi
patent: 4869342 (1989-09-01), Borst

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