Fire escape – ladder – or scaffold – Ladder – Supporting surface compensating means
Patent
1993-06-11
1994-07-05
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Ladder
Supporting surface compensating means
182111, E06C 744
Patent
active
053259360
ABSTRACT:
A ladder leveler device to level and stabilize a ladder on an uneven surface, comprising a generally rectangular shaped base plate having a plurality of threaded holes located on each wide end, a plurality of hollow jack screws complimentary to and threading through the plurality of threaded holes on each wide end, a plurality of Allen head bolts reposing freely within the hollow jack screws, washers and lock-nuts on the plurality of Allen head bolts, a square tubular guide attaching longitudinally to the center of the rectangular shaped base plate, a square tubular shaft which is slidable within the square tubular guide, a plurality of longitudinally aligned holes in the center of one longitudinal side of the square tubular shaft, a restraint on one end of the square tubular shaft, a longitudinal cut-out in the center of the side of the square tubular shaft opposite the longitudinal side with the plurality of longitudinally aligned holes, a pivoting foot securing to the square tubular shaft by means of a bolt, a plurality of spacers and a locknut, and a spring biased pin means attaching to the center of the square tubular guide having a circular shaft extending through the square tubular guide, the longitudinal cutout, the plurality of longitudinally aligned holes, and a complimentary hole on the square tubular guide opposite where the spring biased pin means is mounted.
REFERENCES:
patent: 2936849 (1960-05-01), Larson
patent: 4423797 (1984-01-01), Batten
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