Trestle ladder

Details Trestle ladder Trestle ladder

1986-01-31

1987-06-30

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Ladder

Supporting surface compensating means

182122, 182166, E06C 1383

Patent

active

046763422

ABSTRACT:
A trestle ladder includes adjustable leg extensions to accommodate uneven and irregular surfaces while maintaining the ladder in proper vertical and horizontal orientation. A binding clamp is employed to retain the extension in the desired position and auxiliary rungs are provided for use when the extension of the legs is sufficient to require them.

REFERENCES:
patent: 541806 (1895-06-01), Bobrick
patent: 763209 (1904-06-01), Schwalke
patent: 2943536 (1960-07-01), Stafford
patent: 3276543 (1966-10-01), Kanoza
patent: 3710894 (1973-01-01), O'Dell
patent: 4587864 (1986-05-01), Kassai

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