Fire escape – ladder – or scaffold – Ladder – Slidable nested single rung units
Patent
1996-07-31
1998-04-28
Chin-Shue, Alvin C.
Fire escape, ladder, or scaffold
Ladder
Slidable nested single rung units
182210, 182211, 182228, E06C 100
Patent
active
057433550
ABSTRACT:
A retractable ladder having a low coefficient of friction plastic bushing is received within a coupling that joins a ladder rung to the associated longitudinal stile. The coupling is press fitted to the bushing, compressing a portion of the bushing against the stile, slightly deforming the adjoining portion of the stile to lock the assembly together. A latch having an inwardly sloping surface locks the ladder stiles in an extended condition and cannot be withdrawn to retract the ladder when the ladder is supporting a normal load. Dampers having orifices also are mounted in some or all of the hollow stiles to regulate the flow of air from the retracting stiles and, in this way to retard the velocity with which the ladder retracts to a predetermined, safe value.
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McDonnell Charles A.
Silverman Leonard
Chin-Shue Alvin C.
Smith Richard M.
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