Device for barring access to the top of a vertical tubular duct

Details Device for barring access to the top of a vertical tubular duct Device for barring access to the top of a vertical tubular duct

1988-10-25

1989-11-21

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Door and ladder

182106, 182116, E06C 910, E06C 536

Patent

active

048816191

ABSTRACT:
Access to the top of a caged ladder (2, 3) is barred by the device of the invention which comprises a door panel (6) and a closure member (10) both hinged about respective vertical axes (7b, 12), and interconnected like a pair of compasses by a hinge piece (11) and a lever (14) which engages in a slot (13) of the hinge piece.

REFERENCES:
patent: 257867 (1882-05-01), Hendricks
patent: 956183 (1910-04-01), Scherrer
patent: 2535544 (1950-12-01), McKinley
patent: 3038555 (1962-06-01), Da Lee
patent: 4524848 (1985-06-01), Russo
patent: 4664225 (1987-05-01), Coutier

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