Fire escape – ladder – or scaffold – Torso harness – Ladder-associated
Patent
1979-11-14
1981-02-24
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Torso harness
Ladder-associated
A62B 3500
Patent
active
042522145
ABSTRACT:
A fall prevention safety device for attachment to a harness worn by a workman for providing a safely controlled descension rate from an elevated structure includes a cable having one end connected to the harness and strung around a double pulley system having an upper pulley mounted to the elevated structure and a lower pulley mounted to the upper end of a vertically reciprocal plunger which falls substantially unimpeded into a hydraulic cylinder. The cylinder substantially resists upward withdrawal of the plunger. The other cable end is connected to the upper pulley yoke such that during ascent of the workman up the structure, the lower pulley and plunger move downwardly and take up cable slack. If the workman slips and falls at any point during ascent, the cable immediately and automatically provides descension at a controlled rate determined by the resisted withdrawal rate of the plunger as the cable now pulls the lower pulley upward. The hydraulic cylinder includes a bypass line with ports communicating with the hydraulic cylinder at upper and lower compartments above and below the inner plunger end having a seal therearound defining the two compartments. The inner plunger end also carries a one-way valve which is in an open condition during downward plunger movement and is closed by fluid pressure upon initiation of workman descent.
REFERENCES:
patent: 481252 (1892-08-01), Brainard
patent: 495437 (1893-04-01), Steegmann
patent: 511896 (1894-01-01), Killeen
patent: 1272160 (1918-07-01), Weiss
patent: 1630484 (1927-05-01), Fritts
patent: 1849725 (1932-03-01), Quick
patent: 1927469 (1933-09-01), Plumpton
patent: 2368081 (1945-01-01), Marsh
patent: 2538904 (1951-01-01), Herod
patent: 2616609 (1952-11-01), Herod
patent: 2670890 (1954-03-01), Hodge
patent: 2829814 (1958-04-01), Warner
patent: 2946396 (1960-07-01), McDougal
patent: 3130815 (1964-04-01), Zahner
patent: 3137487 (1964-06-01), Lesser
patent: 3220511 (1965-11-01), Holkesvic
patent: 3260328 (1966-07-01), McGowan
patent: 3826335 (1974-07-01), Allen
patent: 3908791 (1975-09-01), Kleine
Sala, Safety Block Fall, Machinery Center Inc. P.O. Box 964, Salt Lake City, Utah.
Dubl-Lock, Ladder Climber's Safety Device, Atlas Safety Equipment Co. Inc. 28-48 Roebling St. Brooklyn, N.Y.
Rohn-Loc, Safety Climbing Device, Rohn Manufacturing Division of UNARCO Ind. P.O. Box 2000, Peoria, Ill.
Ramco, Derrick Glide, Safety Elevator, Ramco Ind. 903 Hodgkins, Houston, Tex.
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