Side rails fastening mechanism for telescopic aluminum step ladd

Details Side rails fastening mechanism for telescopic aluminum step ladd Side rails fastening mechanism for telescopic aluminum step ladd

1990-10-10

1991-11-05

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Ladder with pivoted prop

Section extensible below prop pivot

182195, 182209, E06C 130, E06C 750

Patent

active

050624997

ABSTRACT:
A side rails fastening mechanism for securing the frame fractions of the side rails of a telescopic aluminum step ladders in an extended or collapsed position, comprising an insert block fixedly secured inside each frame fraction at a lower position with a rung secured thereto and a locking bolt fastened inside a transverse hole thereon and pushed by a compression spring to insert through a mounting hole on the frame fraction disposed at an inner side into a lower or upper locating hole on the frame fraction disposed at an outer side so as to firmly secure two connected frame fractions in an extended or collapsed condition.

REFERENCES:
patent: 1337666 (1920-04-01), Remalia
patent: 1712942 (1929-05-01), Smith
patent: 2194856 (1940-03-01), Kostuk
patent: 2542398 (1951-02-01), Crumpton
patent: 2827216 (1958-03-01), Napolitano
patent: 2899009 (1959-08-01), Roth
patent: 2993561 (1961-07-01), Watson

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