Fire escape – ladder – or scaffold – Torso harness – Strand-engaging – with descent retarder
Patent
1976-06-21
1978-05-09
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Torso harness
Strand-engaging, with descent retarder
A62B 108
Patent
active
040882012
ABSTRACT:
A fire escape device includes a portable spool journalled in a casing including a safety hook for suspending the spool from an eyebolt installed in elevated relation to ground level. A support line is wound about the spool and includes a body harness at its free end. For retarding rapid descent of a human body in the harness, a cylindrical rotor extends coaxially from the spool for joint rotation therewith. The spool lies within a cylindrical cup supported by the casing defining a fluid tight chamber coaxially about the rotor. The chamber is filled with a viscous fluid to provide viscous friction forces in the circumference of the rotor. The viscous fluid is dimethyl siloxane having a density between 0.65.times.10.sup.6 and 2.0 .times. 10.sup.6 centistokes and the annular gap between the rotor and the cup is chosen to achieve a descent rate ranging between 3 and 5 feet per second for a human body weighing 250 pounds.
REFERENCES:
patent: 439191 (1890-10-01), Roper
patent: 516117 (1894-03-01), Roper
patent: 3241642 (1966-03-01), King
patent: 3847377 (1974-11-01), Byrd
patent: 3871501 (1975-03-01), Kornylak
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