Extension trestle ladder

Details Extension trestle ladder Extension trestle ladder

1978-12-11

1980-12-23

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Pivotally connected ladders, mutually sustaining

Central upright ladder section supported therebetween

182182, E04G 130, E06C 118

Patent

active

042405220

ABSTRACT:
A device for automatically locking the fly assembly of an extension trestle ladder in an extended or lowered adjustment position. The fly assembly is supported to prevent downward movement by a displaceable member which abuts a rung on the fly assembly along a portion of the length of the rung, which member is spring biased for automatic return to locking position.

REFERENCES:
patent: 838831 (1906-12-01), Wilson
patent: 947810 (1910-02-01), Glidden
patent: 1140390 (1915-05-01), Moulton
patent: 2144440 (1939-01-01), Gaffers
patent: 2210803 (1940-08-01), Dunn

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