Extension ladders with rotary hook locks

Details Extension ladders with rotary hook locks Extension ladders with rotary hook locks

1980-03-26

1981-05-12

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Ladder

Extension

E06C 706

Patent

active

042666317

ABSTRACT:
Extension ladders having a bed section and a fly section comprises automatic hook locks of a rotary type that rotate on shafts carried on brackets parallel to the side rails of the ladder fly section to move between normal hooking positions and intermittent passing positions. Pivoted toggles rotate with the hook locks and serve to move them into their passing position as the fly section is lowered. The hook portions of the locks are contoured to move them into their passing position by contact with step members of the bed section as the fly section is raised.

REFERENCES:
patent: 3502175 (1970-03-01), Bullock

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