Extension ladders with rotary hook locks
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United States of America Patent
Stats
-
May 12, 1981
Grant Date -
N/A
app pub date -
Mar 26, 1980
filing date -
Mar 26, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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Cited Art Landscape
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