Fire escape – ladder – or scaffold – Movable strand escape and means for retarding travel of strand
Patent
1996-09-30
1999-07-27
Stodola, Daniel P.
Fire escape, ladder, or scaffold
Movable strand escape and means for retarding travel of strand
182 5, 182 7, 182192, 182235, A62B 108
Patent
active
059274387
ABSTRACT:
A pulley system particularly useful for lifting or lowering an injured worker includes an upper pulley assembly adapted to be secured to a fixed structure and a lower pulley assembly adapted to be secured to the worker being lifted or lowered and further includes a rope having one end secured to one of the pulley assemblies. The rope is arranged in a substantially conventional manner around the pulleys whereby when a force is exerted on the free end of the rope, the worker can be raised and when a force is removed from the free end of the rope, the worker can be lowered. A pulley wheel forming part of one of the pulley assemblies has outwardly flared internal side walls. The lifting rope passes around the pulley wheel for only approximately 180.degree.. The dimensions of the rope and the pulley wheel are such that the rope engages the side walls of the pulley wheel. The pulley wheel is freely rotatable in a direction that allows the worker to be lifted but is incapable of rotating in the opposite direction when the load is being lowered. As a result, the rope frictionally engages the side walls of the pulley wheel to retard the movement of the rope. A brake prevents movement of the rope in a direction that would allow for descent. The brake is movable between an inoperative position wherein the rope can freely pass therethrough and an operative position wherein the rope can pass through in the ascending direction but not move in the descending direction. The brake is normally biased into the operative position but may be remotely operated to move the same into its inoperative position.
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International Safety Equipment System "99" Advertisement Grip Safety & Rescue Systems GripTech Advertisement.
Lehrer Norman E.
Smith Richard M.
Stodola Daniel P.
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