Fire escape – ladder – or scaffold – Ladder – Supporting surface compensating means
Patent
1992-03-16
1993-01-26
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Ladder
Supporting surface compensating means
182107, E06C 700
Patent
active
051815842
ABSTRACT:
The ladder leveling adapter comprises a pair of spacers adapted to be secured outwardly on the side rails of the ladder between two interconnecting rounds. An elongated bar having a median slot parallel to the rail extends over the spacers and projects below the rails. Each rail and each adjacent elongated bar are connected together by a pair of threaded rods having a nut threadedly mounted on the inner side of the rail and quick release tightening means on the outer side of the bar. A friction means is mounted around each rod between the spacer and the bar for preventing a longitudinal slipping between the bar and the rail. The quick release tightening means comprises a knob axially mounted on the rod having a flat surface abuting on the bar and a lever for slidingly moving the knob against the bar. The knob includes a pin which extends in the slot of the bar for preventing the rotation of the lever relative to the slot, the pin having a length greater than the releasing distance of the release means.
REFERENCES:
patent: 992408 (1911-05-01), Drake
patent: 1323227 (1919-11-01), Kirby
patent: 2147052 (1939-02-01), Noone
patent: 2245306 (1941-06-01), Smith
Chin-Shue Alvin C.
Morneau Roland L.
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